Method for thermal expansion of titanium alloy rectangular cross-section ring to form special-shaped cross-section ring

Abstract

The invention discloses a method for forming a heat bulging annular piece with a shaped cross section by a titanium alloy annular piece with a rectangular cross section. The method comprises the following steps of fixing a preheated die sleeve on a worktable of a bulging machine, and sheathing the heated titanium alloy annular piece with the rectangular cross section onto the periphery of the preheated bulging block in the bulging machine, and into an annular space which is formed by the outer periphery surface of the bulging block and the inner annular surface of the die sleeve; and starting the bulging machine, enabling the bulging block to extrude the annular piece from the inner periphery surface of the annular piece in the axial direction, enabling the annular piece to deform by 12% to 14%, then extruding the annular piece into the inner annular surface of the die sleeve to fill the sealed die cavity formed by the outer periphery surface of the bulging block and the inner annular surface of the die sleeve, and maintaining pressure, so as to form the annular piece with the shaped cross section. The method has the advantages that the bulging shaping is realized by one-time large deformation, so the operation is simplified, and the annular piece with the bulging shaped cross section is formed and has the effects of high size precision, high quality and high productivity. The annular piece with the shaped cross section is mainly used for rotary component parts of tubular cylinders and the like in the fields, such as aerospace.

Description

technical field [0001] The invention relates to a method for bulging a ring, in particular to a method for thermally expanding a ring with a rectangular cross-section of titanium alloy to form a ring with a special-shaped cross-section. Background technique [0002] In the field of ring forming technology, with the development of aviation, aerospace, shipbuilding, nuclear energy, gas turbines, wind power and other industries, the requirements for high reliability, long life and low cost of ring parts require the forming dimensional accuracy, structure and quality of ring parts. Performance also puts forward higher requirements, and the forming of ring parts is developing in the direction of high quality, precision, high efficiency, environmental protection and low cost. [0003] Titanium alloy rectangular cross-section rings (referring to rings with a rectangular longitudinal section) or special-shaped rings (referring to a ring with a non-rectangular longitudinal section) a...

AI Technical Summary

Problems solved by technology

This method adopts an open bulging method to bulge a rectangular cross-section ring into a special-shaped cross-section ring through one large deformation bulging, three consecutive small deformation bulging, and three rotations. Each bulging must be adjusted and controlled by a large number of The process parameters can only be realized, the process is relatively cumbersome, the productivity is low, the energy consumption is large, the production preparation time and production cycle are long, and the requirements for equipment are also high. In the actual production process, it is not conducive to controlling product quality and organizing mass production. It is difficult to obtain high-quality, precise, efficient, environmentally friendly and low-cost ring parts

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